diff --git a/src/ir-normalization/requirements.txt b/src/ir-normalization/requirements.txt
index 6e225b8..d6c0d25 100644
--- a/src/ir-normalization/requirements.txt
+++ b/src/ir-normalization/requirements.txt
@@ -2,7 +2,7 @@ cycler==0.10.0
 kiwisolver==1.0.1
 matplotlib==2.2.2
 numpy==1.15.0
-Pillow==8.3.2
+Pillow==9.0.1
 pyparsing==2.2.0
 pypng==0.0.18
 python-dateutil==2.7.3